Traveling wave mid-IR ZnGeP2 and GaSe optical parametric generators and their spectroscopic applications

Konstantin L. Vodopyanov; Christopher C. Phillips

doi:10.1117/12.206467

10 April 1995 Traveling wave mid-IR ZnGeP2 and GaSe optical parametric generators and their spectroscopic applications

Konstantin L. Vodopyanov, Christopher C. Phillips

Proceedings Volume 2379, Solid State Lasers and Nonlinear Crystals; (1995) https://doi.org/10.1117/12.206467
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

Mode-locked Er:Cr:YSGG laser ((lambda) equals 2.8 micrometers ) pulses with 100 ps duration were used to pump travelling wave optical parametric generators (OPG) based on ZnGeP₂ and GaSe crystals. In the ZnGeP₂ a tuning range 3.9-10 micrometers was achieved in both cases of type I and II synchronism, OPG pump threshold being only 0.25 GW/cm² for 11 mm long crystal, the smallest reported value for travelling wave OPG. Type II synchronism was characterized by OPG linewidth of 30-40 cm^-1, and conversion efficiency up to 18% corresponding to MW peak power; type I had broader linewidth, especially near degeneracy point. In a double- pass scheme OPG had almost diffraction-limited divergence which allowed to focus radiation into a 20(lambda) diameter spot. In case of GaSe crystal the tuning range was larger: 3.5-18 micrometers , but at the expense of higher pumping threshold-4 GW/cm² for a 10 mm long GaSe crystal; quantum efficiency being 1-2%. Results concerning nonlinear spectroscopy of InSb at room temperature and GaAs/AlGaAs multi-quantum wells near (lambda) equals 9 micrometers , with focussed OPG beam intensities of 10⁴- 10⁸ W/cm² will be also presented.

Citation Download Citation

Konstantin L. Vodopyanov and Christopher C. Phillips "Traveling wave mid-IR ZnGeP2 and GaSe optical parametric generators and their spectroscopic applications", Proc. SPIE 2379, Solid State Lasers and Nonlinear Crystals, (10 April 1995); https://doi.org/10.1117/12.206467

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